You mean to go back in time. Even with the power of time on her side, the Empress is unable to accomplish this. Much has been done in what can be done with Hours and time-but it only slows time down, or hastens it.

[Sip.]

he only way to go back in time seems to be through a Weft of Unraveled Time. But that is...quite random, as you might have noticed. And dangerous. And really makes the problem worse.

There is no guarantee you will even go back in time and not go forward, in any case.